Chakles t



(No Model.) 1 'Y C. T. LORING.

'I'ELEPIEILWE SWITCH.

m1289353.- Paxnted Nov. 27,1883.

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Unirse Srnrns PATENT, Erica.

CHARLES T. LORING, OF BOSTON, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE ADJUSTABLE TELEPHONE SUPPORT COMPANY,

or sAME PLAGE.

TELEPHONE-SWITCH.

t SPECIFICATION forming part of Letters Patent No.- 289,353, dated November 27, 1883. Application filed July 5,1853. (No model.) u

fou/ZZ whom t Hwy/concern:

Be itknown that I, GHARLEs T. LoRiNG, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain newand useful' Improvements in Telephone-Switches, of which the following1 is a full, clear, and exact description.

`In the practice of the telephonie system of d communication, central offices, so termed, IO are" established, through which, on notification, the necessary electric connections orcir- Acuits for telephonie communications are made; Y

as the same may be requested-as, for instance, either between local stations belonging either A I5 to the same central otlice or to differentcentral offices, or between different central oiiices, and so on, as wellknown. I n all cases, at each central oiiice, all the separate local stations and the` separate central oflices connected therewith are represented by separate' `and distinctively numbered or otherwise marked and designated si gnaldrops, or rather annunciator-drops,t" as they are more par-` ticularly called. `These drops are each arranged and otherwise connectediso that when a call is made, orrather rung in,` as it is termed, at a central oflice from another central oflicc, or from a local station of the several central offices and local stations reprel sented by said annunciator-drops, theannuuciatordrop corresponding thereto will fall or otherwise be so changed in position as to notify the central office thereof, when said drop is replaced and the desired connection or circuit for telephonie communication is made. After which, on its being finished, a calling erringing-in, as before, is again made, similarly notifying the central office of the fact, when the drop is again replaced, and the electric coni 4o nection or circuit for telephonie communication made, as before stated, is broken, all as well known. This calling or ringing-in of a central office heretofore has been accomplished by means-Qns, for instance, a magneto-niachine," as it iscalled-that are separate and distinct from the telephonie switch of each local station or central ofli'ce, as the case may be, and by the movement of which said local station or central office, as the case maybe,

ltially, in the combination, with the mechanism is placed out of the call-circuit and into the 5o telephonie circuit, or vice versa, of the central office being called or rung in. l f

The object of this invention is to dispense with these said separa-te and distinct meanssuch as the magncto-machine-for the purpose of calling or ringing in the central oflice, as above described; or, in other words, in substance, to secure by the movement alone of said switch either from the call to the tele phonic circuit or from the telephonie to the call circuit, the calling or ringing-in and notiiication of the central office, as before cxplained.`

To this end this invention consists, lessenand circuit-connections of telephonie switches, and instruments as ordinarily or otherwise suitably arrangedof mechanism and a cir; cuit-connection therefor, to secure from the passage of the switch from the call to the tele- `phone-circuit, or vice versa, a signaling of the central office in accordance therewith, all substantially as described.

In the accompanying plate of drawings, one way of carrying ont this invention is illustrated.

Figure 1 is a plan view. l Fig. 2 is in part a side elevation and a vertical section. Fig. 3 is a horizontal section on line 3 3, Fig. 2; Fig. 4 is a vertical section on line 4: 4, Fig. 2. Fig. 5 is a ver-tical section on line 5 5, Fig. 4; Fig. 6 is a diagram illustrating the` ordinary wire connections of the several parts of telephonie apparatus, to wit: the telephone switch, receiver, transmitter, bell or alarm, annunciator-drops at central office, local 1battery, and main linewith the ground, and also one arrangement of wire-connections for making a circuit to secure the signaling of the central office inaccordance with this invention, 9o because of the movement of the telephoneswitch from the call to the telephone circuit, and vice versa. i

In the drawings, A represents a telephonereceiver carried by an arm, B, arranged to he V9 5 swungwithin given limits upon a support, C, iixed in position in any .suitable manner. This arm B is the telephone-switch lever, and

2 remesa it carries three insulated screw-cups or binding or contact posts, c b fr One, a, of these contacts is upon one side, and the remaining two, I) and j', are upon the other side of the vswitch B, as to the opposite sides of the support C for said switch.

7L and Z are two insulated screw-cu ps or binding or contact posts upon the support C, which are located in a position, if the switch is properly swung in one direction upon its support C, to be simultaneously in contact by thepost 7L with the post b, and by the post Z with the postf of the switch, and if the switch is properly swung in the ot-her and opposite direction upon its support to be in contact only by the post h with the post a of the switch. rIhe posts (t, b, and ,f of the switch, and the posts h andl ofthe support C for said switch, are severally connected by wires, as illustrated in diagram Fig. A(j, and as ordinarily with the transmitter R', receiver A, local battery E, bell or alarm F, annu nciator-drop G at central office, 'and the ground at H, J, and K, whereby,with the p'ost a of the switch in cont-act with the post h of the support C therefor, which is the normal position of the switch, the callcircuit is established, and the telephonie and local-battery circuits are broken; and with the posts b and j" of the switch in contact with the posts h and lof the support G therefor, the telephonie and local-battery circuits are established and the call-circuit is broken, all as usual. rIhe switch is held in its normal position, establishing callcircuit, as above described, by means of a spring, I), arranged about the fulcrum-pin L of the switch, and at one end fastened tothe switch and at the other end to its support; and in making the telephonie and local-battery circuits, and breaking the call-circuits, as above described, the switch is moved against said spring, and this spring,on the release of the pressure upon the switch to so move it, reacts and throws the switch into its .normal position, establishing the call-circuit and breaking the telephone and local-battery circuit.

In the wire-connections above referred to the post h of the switch-support is connected with the main line, and this post has a horizontal spring-finger piece or prong', m, which projects from it and into position for a horizontal [inger-piece or prong, a, that is carried by the switch as said switch is swung upon its fulcrum, making and breaking the circuits, as `above described, to pass or slide over and in contact with said stationary ingerpiecc'm. The linger-piece a of the switch is part of a metal plate, r, connected to a post, d, of the switch, all insulated from the switch, and this post d in either position ot' the switch has no cont-act with the posts 7L l of the support. rI`he post d of the switch, as shown in diagram Fig. (i, is connected by a wire, t, with one pole of a local battery, M, the other pole of which is connected with the ground at N, and consequently with the finger-pieces or prongs m or a of the switch and its support in contact. A circuit is established through the main line, local battery M, ground at H and N, and annunciator-drops G in central office, and through its action said annunciator-drops at the central office are made to fall or drop, and thus the central office is notified and signaled, as usual, and therefore needing no more particular description herein. rIhis contact of the prongs m a, respectively, of the switch and support, is made in either movement of the switch, and, as is plain, during the passage of the switch from the call-circuit to the telephone-circuits, and vice versa, it secures a similar signaling of the central office in both cases, provided, of course, the annunciatordrop, after it has dropped in passing from call to telephonie circuit, or vice versa, has been replaced.

Heretoi'ore this signaling of the central ofiice has been accomplished with a magnetomachine or other means which are operated separate and distinct from the operation of the telephone-switch, while in this invention the movement itself' of the switch alone signals the central ofti ce.

In the diagram Fig. G, a loeal battery marked M, separate from the ordinary local battery marked E, is shown as used for making the v,electric circuit for the intervening switchingprongs m and n of the switch and its support. This battery M, however, may be dispensed with, and the connection of post d made bywire with the ordinary local battery, E; or, again, a battery in the main line may be employed. Yielding or unyielding contacts for the switch and its support may be used, but yielding contacts obviously are preferable, and, again, the intermediate electric circuit-connection made as the switch passes from call to telephone circuit, or vice versa, obviously may be applied to other forms of switches as well as that herein particularly shown and described, and therefore this invention is not to be limited thereto.

The ordinary local battery, E, may be dispensed with, in which case the contacts f and l would not be required 5 but it is preferable to use it.

Having thus described my invention, what I claim is 1. In a telephone-switch of suitable construction, and electrical connections to make and break the call and telephone circuits, the combination of contact-pieces arranged as the switch passes from one to the other of said circuits, and in either direction for the one contact to slide across and over the face of the other contact, and thusY to establish a circuit and through it to signal,substantially as described, for the purpose specified.

2. A telephone-switch and its support having contacts a, b, and h, said contacts being electrically connected, in combination with prong m of said contact 71 and electricallyconnected prong a, substantially as described, for the purpose specified.

3. A telephone-switch having contacts a, b,

f, h, and Z, said contacts being electrically connec-ted, andthe contact l, with a local battery, E, and a transmitter, It, in combination with prong m of said contact h, and electrically` connected prong n, substantially as described, for the purpose specied.

4. A telephone-switch having contacts a, b, and h, said contacts being1 electrically connected, in combination With prong` m of con- 1o tact h and prong u, electrically connected with connected, and the contact l, With a local battery E, and a transmitter, R, in combination With prong m of contact 71, and pronga, electrically connected with a local battery, M, and ground, substantially as described, for the purpose specified.

l In testimony whereof I have hereunto Set my hand in the presence of two subscribin Witnesses.

CHARLES T. LORING'.

Vitnesses:

CHARLES W. HOLDEN, EDWIN W. BROWN. 

